Feature request - Support custom annotations

[xoanmi]

Is your feature request related to a problem? Please describe.
Currently, the operator doesn't support injecting custom annotations.

Describe the solution you'd like

apiVersion: goharbor.io/v1beta1
kind: HarborCluster
metadata:
  # These annotations should be injected into all objects created by the operator
  annotations:
    foo: 'xyz'
spec:
  core:
    # These annotations should be injected only into core components
    annotations:
      bar: 'abc'

Describe the main design/architecture of your solution
Be able to define generic annotations that will be injected in all objects as well as custom annotations per component (core, registry, trivy, etc).

Additional context
We would like to configure Monitor Prometheus metrics with dynatrace so we need to annotate the pods who export metrics: exporter, core, jobservice, and registry.

annotations:
    metrics.dynatrace.com/scrape: 'true'
    metrics.dynatrace.com/path: '/path/to-metrics'
    metrics.dynatrace.com/port: '9001'

[bitsf]

this seems be required by issue #967

[xoanmi]

this seems be required by issue #967

Hi @bitsf! We have pushed a PR to support custom annotations for deployment templates: #973